Calling a dissector

Hello List,

I have read that there are three ways to call a dissector:

1) A dissector can call another dissector directly
2) A dissector can setup a lookup table for other dissectors to register on
3) A dissector can ask to look at the data of the packets tha do not match 
any other protocol


Now, I'd like you to give me an example of each:

1) I suppose here it's the case where there is well-known small set of 
subdissectors for this dissector.

2) Here it's the case of all UDP or TCP subdissectors, isn't it?

3) Is it the case of heuristic dissectors?


Thank you,

Matthew

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